Hierarchy of Models for the Study of National and Regional Energy Security

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Abstract
This paper focuses on the specific features of the hierarchical approach in the energy security studies for modeling the processes of functioning and development of industry-specific energy systems within a single energy sector. The experience of developing and using hierarchical modeling in the study of reliability and survivability of energy systems is analyzed using the example of the unified gas supply system, oil system, oil product system, and the unified power system of Russia. In the paper, the hierarchy of models in the energy security studies is considered in terms of territory and structure.